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2 dots.
d. The VOR/LOC flag should be buried.
e. The RMI should point to the 315 degrees radial(

5 degrees).
f. The marker beacon lamp(s) should illuminate.
3-3-3. Controls and Function, VHF Navigation and
Instrument Landing System Set. (fig. 3-3-1)
CONTROLS/
INDICATOR
FUNCTION
NAV VOL Provides power to set
when turned from OFF.
Turning knob clock-wise
increases volume.
VOR/MB TEST Switch spring-loaded
from TEST position. At
TEST, the MKR BCN
lights illuminate.
Megahertz Select Knob Selects last two digits of
frequency in 50 -kilohertz
increments.
MB VOL Adjusts audio output level
of marker beacon receiver.
Provides power to
the marker beacon when
turned from OFF.
TM 1-1520-240-10
3-3-2
CONTROLS/
INDICATOR
FUNCTION
MB SENS Labeled HI and LO. LO
sensitivity is used for
positive identification of
marker beacon passage.
HI is used for station
passage identification at
the outer marker or enroute.
Marker Beacon Indicator
Lights
Three lights marked 0,M,
and I on both HSI MODE
SELECT panels. Lights
illuminate when passing
over beacons.
3-3-4. Normal Operation - VHF Navigation and Instrument
Landing System. The following paragraphs
provide navigation radio set operating procedures.
a. Starting.
(1) Interphone AUX switch - ON
Figure 3-3-1. VHF Navigation and Instrument
Landing System Control (AN/ARN-123)
(2) NAV VOL switch — ON.
b. VOR/Localizer/ILS Operation.
(1) Megahertz and kilohertz selector — Set frequency
of facility.
(2) VOR SEL switch on HSI MODE SELECT
panel — Press. Check SEL light lit.
(3) VOR ADF switch on HSI MODE SELECT
panel — Press, if VOR segment is not lit
(4) Volume control — Adjust. Identify facility
(5) HSIs — Check for correct indications.
c. Marker Beacon operation.
(1) MB VOL switch — ON.
(2) MB SENS — HI for enroute. Lo for approach.
(3) MKR BKN lamps on HSI MODE SELECT
panels — Check lit at corresponding station passage.
d. Stopping — NAV VOL and MB VOL switches —
OFF
3-3-5. Direction Finder Set (AN/ARN-89).
Direction finder set (AN/ARN-89) is an airborne automatic
direction finder (ADF) operating within the frequency
range of 100 to 3,000 kHz. The equipment provides visual
and aural facilities for ADF homing and position fixing.
It is used as a navigational radio aid to continuously and
visually indicate the magnetic bearing of a radio station
while providing aural reception. The bearing of a radio
station is displayed on the No. 2 bearing pointer on the
HSI. Power to operate the direction-finder set is supplied
by the No. 1 DC bus and the AC instrument bus through
the NAV ADF circuit breakers on the No. 1 PDP.
3-3-6. Controls and Function, Direction Finder Set
(AN/ARN-89). (fig. 3-3-2)
CONTROLS/
INDICATOR
FUNCTION
Mode Switch OFF OFF position deenergizes
the direction finder
set.
COMP COMP position selects
automatic direction finding.
ANT ANT position permits reception
for radio navigation
or as a broadcast
receiver.
LOOP LOOP position, used in
conjunction with LOOP
switch, permits aural null
homing and manual direction
finding.
TM 1-1520-240-10
3-3-3
CONTROLS/
INDICATOR
FUNCTION
AUDIO Control Adjusts audio level in
COMP position. Used as
RF gain control in LOOP
or ANT position.
LOOP Switch When function switch is
set to LOOP, LOOP
switch enables manual
rotation of ADF loop antenna
and bearing indicator
pointer left or right
for manual direction
finding, or when homing
to a radio station. Returning
LOOP switch to
center position stops
rotation of bearing indicator
pointer at any desired
position.
Figure 3-3-2. Direction Finder Control
CONTROLS/
INDICATOR
FUNCTION
Coarse Tune Control Tunes receiver in 100
kHz steps as indicated
by first two digits of KILOHERTZ
indicator.
Fine Tune Control Provides selection of 10
kHz digits (continuous
tuning) as indicated by
last two digits of KILOHERTZ
indicator.
CONTROLS/
INDICATOR
FUNCTION
KILOHERTZ Indicator Displays operating frequency
to which receiver
is tuned.
TUNE Meter Provides indication of
relative signal strength
while tuning receiver to
specific radio signal.
CW-VOICE-TEST Switch Three position toggle
　
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